Gah! we always do this with my cat, Oona. it's strictly our thing, Oona doesn't do it with anyone else. ^_^ Although, usually when she gives me headbutts I kiss her forehead instead of headbutting back. lol, "headbutt" what a word. XD

Only my alpha male does this with me (I have always said "bonks" when he did it, and now he'll do it almost on command). My other two brother and sister kitties don't do it to me, but will do it frequently to Sylo, my alpha.

I like to think they see him as the Love Courier. Kinda like a vicarious "bonk", I guess...or something...